20890869 has 8 divisors (see below), whose sum is σ = 28753152. Its totient is φ = 13477920.

The previous prime is 20890867. The next prime is 20890871. The reversal of 20890869 is 96809802.

It is an interprime number because it is at equal distance from previous prime (20890867) and next prime (20890871).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20890869 - 2¹ = 20890867 is a prime.

It is a super-2 number, since 2×20890869² = 872856815150322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20890869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20890867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112224 + ... + 112409.

It is an arithmetic number, because the mean of its divisors is an integer number (3594144).

Almost surely, 2^20890869 is an apocalyptic number.

It is an amenable number.

20890869 is a deficient number, since it is larger than the sum of its proper divisors (7862283).

20890869 is a wasteful number, since it uses less digits than its factorization.

20890869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224667.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 20890869 is about 4570.6530168019. The cubic root of 20890869 is about 275.4136760274.

The spelling of 20890869 in words is "twenty million, eight hundred ninety thousand, eight hundred sixty-nine".